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Quantum-memory-assisted entropic uncertainty relation with a single nitrogen-vacancy center in diamond
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10.1063/1.4771988
/content/aip/journal/apl/101/24/10.1063/1.4771988
http://aip.metastore.ingenta.com/content/aip/journal/apl/101/24/10.1063/1.4771988
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Figures

Image of FIG. 1.
FIG. 1.

(a) Structure of a single N-V center in diamond including the electron spin and the nuclear spin. An external magnetic field B is applied along the [111] axis of the N-V center to form the quantization axis. (b) Electron–nuclear spin level diagram, where electronic ground states and nuclear spin states are employed to encode the two-qubit system. (c) Schematics for testing the quantum-memory-assisted entropic uncertainty relation and witnessing the entanglement between electron and nuclear spins. The first dashed box is only for testing the uncertainty relation, which is not necessary for the procedures of witnessing entanglement. and in the second box are two noncommuting observables. The third box represents the polarization of electron spin and the forth box is used to transfer the nuclear state to the electronic state by mapping operations, which will be followed by the fifth box by performing the same measurement as the second box on the electron spin again.

Image of FIG. 2.
FIG. 2.

(a) An example of testing the quantum-memory-assisted entropic uncertainty relation with Schmidt state and observables and . The uncertainty , measurement estimation (ME), and the concurrence (C) are represented by blue solid, orange dashed, and black dotted curves, respectively. (b) Entanglement witness of electron and nuclear spins in a single N-V center. The blue solid, orange dashed, and black dotted curves denote , U = ME, and C, respectively.

Image of FIG. 3.
FIG. 3.

Electronic dephasing effect on the uncertainty of observables and performed on the state . Parameters are adopted in Ref. 27 with and in Ref.28 with .

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/content/aip/journal/apl/101/24/10.1063/1.4771988
2012-12-12
2014-04-16
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Quantum-memory-assisted entropic uncertainty relation with a single nitrogen-vacancy center in diamond
http://aip.metastore.ingenta.com/content/aip/journal/apl/101/24/10.1063/1.4771988
10.1063/1.4771988
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